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Laminate material will mean even better Tetra seals

Tetra Pak's Tetra Brik Chilled, Tetra Top and Tetra Brik Aseptic cartons, will soon, starting this month, incorporate a new polyethylene-based material which the company claims will provide a stronger, tighter inner barrier seal.

The “Wide” inner lamination material is formed from a specially developed PE, “metallozene”, whose key claimed benefits include uniform molecular weight, polymer chain structure and polymer morphology. Wide reportedly seals at an extended temperature range via induction heating; Tetra Pak says Wide packs will offer improved sealing and greater crack resistance than those made with current extrusion-laminated (non-film) specifications, alongside enhanced filling line efficiency.

Product manager Ian Williamson says: “Wide’s introduction opens the door to the creation of new combinations of various polymer properties, including greater elasticity, a larger sealing window and improved stress crack resistance, meaning reduced sensitivity to aggressive products.”